Folic acid, AKA folate (folic acid) (vit B9), is recommended for all women wanting to get pregnant -- 0.4mg (400mcg) daily, which is important for preventing birth defects like spina bifida. Women w/ a hx these disorders should take 10x that amt daily -- 4mg (4000mcg) through the 3rd month of pregnancy. It won't affect fertility, chances of conception/twins, or periods. Can help with anemia.
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Hypothyroidism?:
The labs that you report are normal. The symptoms are not normal. The symptoms are somewhat suggestive of hypothyroidism. I would recommend addressing the symptoms with your child's pediatrician.
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7

Stop worrying:
Reference ranges are set so that a few percent of healthies fall outside. I wouldn't give that stuff another thought. A decade ago, this was being tooted as a new coronary risk factor but most of the pathologists I know disregard it. Your B12 and folate (folic acid) are fine. There's nothing you're going to do about this. It probably means nothing. * say, "Forget it." But ask your own physician.
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10

Stop worrying:
We see these from time to time. They are no cause for concern. Reference ranges are set for the vast majority of people. Just be happy. Elevated B12 has some arcane significance in hematology but it does not apply to healthy people. Just be glad.
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